Diffraction at a double slit

Principle

The object of this experiment is to prepare the ground for understanding the structure and function of optical transmission gratings.
Normally it would not be necessary to take measurements in order to gain an understanding of the interrelationships between slit spacing and slit width on the one hand, and spacing brightness and definition of the interference fringes on the other hand. However, we do suggest measuring the fringe gaps because this automatically draws the students' attention to the accuracy of the test results.

Benefits

• Multifunctional light box - All-in-one: Can be used for geometric optics on the table, colour mixing and on an optical bench
• Extension with others sets at anytime, no additional light sources needed, recognition value for students

Tasks

How do slit spacing and slit width affect the interference pattern when working with double slits? Investigate how the interference pattern varies according to slit width b and slit spacing g when light is diffracted at a double slit. Then determine the wavelength of red light.